-
A termination of adjectives (and in the plural of nouns from adjectives) formed from nouns in -ist, and having reference to such nouns, or to associated nouns in -ism, as in deistic, theistic, euphuistic, euphemistic, puristic, linguistic, subjectivistic, objectivistic, etc. In nouns it has usually a plural form, as in linguistics.
(noun)
The Century Dictionary (Public Domain)